Raphael is small JavaScript library that should simplify your work with vector graphics on the web.If you want to create your own specific chart or image crop and rotate widget, for example, you can achieve it simply and easily with this library.

Open edX is the open source platform that powers edX courses. It's freely available to the community. Institutions can host their own instances of Open edX and offer their own classes. Educators can extend the platform to build learning tools that precisely meet their needs.